Furnace.



PATENTED'SEPT. l, 1903.

W. W. WEAVER.

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W. W. WEAVER.

FURNACE.

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PATENTED SEPT. 1, 1903'.

W. W. WEAVER.

FURNACE.

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PATENTED SEPT. 1, 1903.v

UNITED STATES Patented September 1, 1908.

PATENT OEEIcE.

WILLIAM NV. \VEAVER, OF CHICAGO, ILLINOIS, ASSIGNOR TO HOT BLAST SHOKELESS STOKER COMPANY, A CORPORATION OF ARIZONA TERRL TORY.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 738,132, dated September 1, 1902.

Application filed December 12, 1901. Serial No. 851550. (No model- To aZZ whom, it may concern:

Be it known that 1, WILLIAM W. WEAVER, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact specification.

My invention relates more particularly to that class of furnaces known as fine-fuel furnaces in which pulverized, comminuted, or other fluent fuel is employed; and the invention has for its primary object to provide improved, simple, and efficient means for intercepting or baffling the flying products ofv combustion by incandescent or heated surfaces or members so arranged and combined as to retard and ignite them without detrimentally impairing the draft.

\Vith these ends in view myinvention consists in certain features of novelty in the construction, combination, and arrangement of parts by which the said objects and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings, and more particularly pointed out in the claims.

In the said drawings, Figure l is a front elevation of my improved furnace. Fig. 2 is a transverse sectional view thereof, taken on the line 2 2, Fig. 3. Fig. 3 is a longitudinal sectional view taken on the irregular section- -line 3 3, Fig. 1. Fig. 3 is a detail vertical section taken on the line a a, Fig. 1. Fig. a is a plan section taken on the irregular sectionline 4: 4, Fig. 3. on the line 5 5, Fig. 3, and Fig. 6is a vertical section taken on the line (3 6, Fig. 3.

The fine fuel, such as pulverized or comminuted coal or other suitable material, may be fed into the fire-box of my improved furnace by means of any suitable injector or other device capable of projecting it into the firebox with a sufficient admixture of air to cause combustion and the requisite draft. In the example of the invention shown in the drawin gs the fine fuel is placed in a hopper 1, having two outlet-necks 2 3, which lead to valvehousings l 5, respectively, in which are arranged any suitable feed-valves for uniformly feeding the fuel from the hopper to the in- Fig. 5 is a plan section taken jecting means. The particular example of valve shown in Fig. 3 consists of a cylindrical member 6, arranged in the housing 4.- and provided in its periphery with a series of pockets '7, which successively come into register with the outlet-neck of the hopper and a downwardly-extending pipe or passage The two valves in these housings 4: 5 are secured to the same shaft 9, which is jour= naled in suitable bearings 10 on the sides of the housings and is provided with a cone-pulley 11, whereby the valves may be rotated at various speeds as desired for feeding more or less fuel into the pipes or passages S to suit the requirements of the 'l'll'B. Connected to thelower ends of these pipes or passages S are curved necks 12, which are respectively se cured to two nozzles 13, projecting into chambers 1+1 15, formed in the front of the furnace setting 16, and by which necks 12 the fuel is brought within the influence of a forced current of some suitable fluid-fuel element-such as air or steam, preferably hot airadmitted to the lower sides of the neck 12 through inlet connections 17, one of which is formed on or secured to each of said necks. The air prior to entering the necks 12 for forcing the fuel through the nozzles and into the fire-box is heated by the heat of the furnace in a pipe or passage 18, which passes along one side wall and thence through the bridge-wall 19 and out again through the other side wall, where it is connected by cross-pipe 20 and nipples 21 to the necks 1'2, 22 23 being valves interposed between the necks 12 and nipples 21 for regulating the amount of air passing through the nozzles. Each of the nozzles 12 is also provided with a supplemental or auxiliary inlet connection 24, connected to cross-pipe 20 by means of a T 25, from which branches two connections 26 27, connected, respectively, to the auxiliary inlets 24c and having valves 28 29, respectively, whereby the flow through the auxiliary inlets may be controlled. The purpose of these auxiliary inlets 24 is to prevent banking of the material at the point where the main inlet 17 enters the neck, it being observed that the auxiliary inlet 21 is arranged in a slightly-inclined position with reference to the inlet 17. Surrounding each of the nozzles 13 is an air-inlet casing 30, embedded or otherwise secured in the front wall of the furnace and communicating with the external atmosphere, and threaded on the inner ends of each of the necks 12 is a disk 31, which constitutes a damper or draft-regulater by being capable of more or less closing the inlet end of the casing 30 when adjusted along the threads of the neck. The features of my invention thus described, however, constitute the subject-matter of the claims in a copending application, and therefore will not be claimed or more fully described herein.

The chambers 15, into which the nozzles project, are arranged at the forward side of the fire-box in a plane above the gratebars 33, and the grate-bars are floored over for a short distance just in front of the chambers 15 by means of fire-brick, tile, or other suitable substance 34, so as to preclude the possibility of any uneonsumed fine particles of fuel fallinthrough the grate-bars into the ashpit. Supported upon the grate-bars immediately in front of the flooring 3% and extending from said flooring to the bridge-wall 19 is a series of vertical partitions 35, arranged at short intervals throughout the width of the fire-box and extending longitudinally of the line of draft, so as to constitute the side walls of a plurality of horizontal passages for the flame and products of combustion, said passages being open at the bottom through the grate-bars 33, but are in greater part closed at top by a covering of fire-brick or other suitable material 36,wl1ich, as better shown in Figs. 3 and 5, are supported at short intervals apart on the partitions 35, so as to provide the top of each of said horizontal passages with a 1nultiplicity of transversely-elongated slits or apertures 37, through which a portion of the prod nets of combustion passes and impinges directly against the crown of the fire-box, which in my invention is also provided with a multiplicity of apertures. This crown is consti tuted, preferably, by an arch, as shown in Fig. 2, comprising a plurality of bricks 38, each having a pair of longitudinal slits or passages 39, whereby the arch will be of a foraminous character throughout its entire surface, as better shown in Fig. 4:. W'hen the furnace is used for heating some object placed directly over it, such as a steamboiler '40, such object or boiler should be arranged a slight distance above the arch, as shown in Fig. 2, so that the products of combustion may impinge directly against the bottom of the boiler as they emerge from the slits 3f).

Arranged at the after or inner ends of the partitions 35 and at a slight distance therefrom is a series of baffle-brick 41, which are in the form of fingers arranged at a slight distance apart entirely across the fiameway above the bridge-wall, said baffle-brick 41 being incorporated in the arched crown. of the fire-box, as shown in Figs. 3 and at, and said arched crown is extended rearwardly over and beyond the bridge-wall and said bafliebrick, and arranged below but in a plane back of the baffle-brick 41 is a second series of standing bathe-brick 42, which, like the baffle-brick 41, are in the form of fingerslocated a short distance apart, a plurality of such fingers being formed on each brick, as better shown in Fig. 6, and the bricks being supported in a row along the bridge-wall across the fiameway, with the body portions of the bricks standing above the level of the bridge wall, as shown in Fig. 3, so that the products of combustion as they emerge from the passages between the partitions 35 will be more or less impeded by these finger-shaped bafflebrick, and thus not only retained in the firebox the length of time requisite for causing perfect combustion, but will impart an intense heat to these bafiie-brick, keeping them in an incandescent state suitable for igniting any gases or products of combustion which may escape from the longitudinal passages and at the same time serving to direct the flame and products of combustion upwardly against the overhanging rearward extension of I the firebox crown-sheet, which being heated to a high degree by the flame passing over the bridge-wall and that coming through the slits 37 is also enabled to ignite and thoroughly consume any products of combustion which may escape the baffle-brick 41 42, directing the heat therefrom up against the boiler through the slits 39.

As better shown in Figs. 5 and 6,the side walls of the bridge -wall are laterally contracted, so that the flameway over the bridge-wall will be of less width than the fire-box 32, whereby the strong current or draft induced by the injectors will be prevented from blowing the fuel too rapidly across the bridge-wall or before it has had time to become thoroughly consumed. It will also be seen that while the foraminous crown of the fire-box extends throughout the entire length and breadth thereof the longitudinal partitions 35 are considerably shorter than the fire-box, thus leav ing the front side of the fire-box over the flooring 34 unobstructed throughout the entire width thereof. There being no draft through the grate-bars immediately in front of the injector-nozzles,where theflooringfiatis situated, the fuel and flame will be induced to enter the longitudinal passages between the partitions 35, where the same will receive the draft rising through the grate-bars, energetic combustion taking place and heating the partitions 35, theirslitted covering, the foraminous fire-box crown, and the finger-shaped bafflebrick, all in a short while presenting incandescent surfaces for baffling and igniting any combustible products which might have escaped from the passages between the longitudinal partitions. The front of the fire-box being unobstructed where the flooring 34 is situated, a part of the fuel and gases will be drawn upwardly through the foraminous firebox crown and between such crown and the covering over the partitions 35, meeting in their passage toward the uptake the more perfectly consumed products arising through the apertured covering over the partitions and through the finger-shaped baftlebrick over the bridge-wall.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is

1. In a furnace the combination of a lire box, a bridge wall, means for injecting a stream of pulverized fuel into the fire-box toward the bridge-wall, a series of passages interposed between said injecting means and bridge-wall, longitudinally of the line of draft and each having its upper side ortop located at a distance below the crown of the fire-box and provided with a plurality of openings for the passage of the products of combustion, substantially as set forth.

2. In a furnace the combination of a firebox having a grate, a bridge-wall, means for injecting a stream of pulverized fuel into the lire-box toward the bridge-wall, a series of passages interposed above the grate between said injecting means and bridge-wall, longitudinally of the line of draft and each having its upper side or top located at a distance below the crown of the fire-box and provided with a plurality of openings for the passage of the products of combustion, substantially as set forth.

3. In a furnace the combination of a firebox, a bridge-wall, means for injecting a stream of pulverized fuel into the fire-box toward the bridge-wall, a series of passages interposed between said injecting means and bridge-wall, longitudinally of theline of draft and each having its upper side provided with a plurality of apertures for the passage of the products of combustion, and a foraminous crown arranged over the apertured tops of said passages at a distance above the same, substantially as set forth.

4. In a furnace the combination of a firebox, a bridgewvall, means for injecting a stream of pulverized fuel into the firebox, a series of passages interposed between said inj ecting means and bridge-wall,longitudin ally of the line of draft and each having its upper side or top provided with a plurality of apertures for the passage of the products of combustion, a fire-box crown provided with apertures arranged over the apertured tops of said passages, and the object to be heated arranged over and at a distance above said firebox crown, so as to allow the products of combustion to pass between said crown and obj ect, substantially as set forth.

In a furnace the combination of a firebox, a bridgewall, means for injecting a stream of pulverized fuel into the fire-box, a series of passages interposed between said inj ectin g means and bridge-wall, longitudinally of the line of draft and each having its upper side or top provided with a plurality of apertures, said passages being of less length than the distance between said injecting means and the bridge-wall, and a foraminous fire-box crown arranged over the apertured tops of said passages and extending throughout the length and the breadth of the fire-box, substantially as set forth.

6. In a furnace, the combination of a firebox, a bridge-wall, means for injecting a stream of fuel into said fire-box, a series of passages arranged in the fire-box between said means and bridge-wall, longitudinally of the line of draft, finger-shaped bathe-brick arranged over the bridge-wall opposite the ends of said passages and a foraminous extension arranged over said baflie-brick and adapted to be impinged by the products of combustion directed upwardly by the baiile-brick, sub stantially as set forth.

7. In a furnace the combination of a firebox, a bridge -wall, means for injecting a stream of fuel into the fire-box, a series of passages arranged inthefire-box between the bridge-wall and said injecting means, longitudinally of the line of draft, downwardlyextending fingershaped baffle-brick arranged over the bridge-wall at the ends of said passages and upwardly-extending finger-shaped baffle-brick arranged over the bridge-wall at the ends of said passages in a different plane from the first said baffle-brick, substantially as set forth.

8. In a furnace the combination of a firebox, a bridge-wail having its side walls contracted laterally or transversely of the line of draft whereby the flam eway thereover will be of less width than the firebox, means for in jecting fuel into the fire-box, a series of covered passages open at the bottom, arranged in the fire-box between the bridge-wall and said injecting means and having their tops provided with a plurality of apertures, substantially as set forth.

9. In a furnace the combination of a firebox, abridge-wall, a grate, means forinjecting pulverized fuel into the fire-box, a series of vertical partitions supported upon the grate at short intervals apart and constituting passages extending longitudinally of the line of draft, and an apertured covering over said partitions, substantially as set forth.

10. In a furnace the combination of a firebox, a bridge-wall, a foraminous crown arranged over the fire-box and extending e11- tirely over the fire-box and rearwardly beyond the bridge-wall, and means over the bridge-wall and under the crown extension for directing the products of combustion upwardly against the extension, substantially as set forth.

11. In a furnace the combination of afirebox, a bridge-wall, means for injecting pulverized fuel into the fire-box, a series of vertical partitions arranged in the fire-boxbetween said injecting means and bridge-wall, a grate over which said partitions are supported, and an imperforate flooring arranged over said grate between said partitions and the injecting means,substantially as set forth.

12. In a furnace the combination of a firebox having a grate, means for injecting fuel into the fire-box, a bridge-Wall, a series of 7 vertical partitions supported on the grate adjacent to the bridge-wall longitudinally of the line of draft, an imperforate flooring between the ends of said partitions and the inj ecting means, an apertured cover over said partitions, baffle brick arranged over the bridge-Wall at the ends of said partitions and lo a foraminous fire-box crown extending over said apertured cover, bridge-Wall and bafflebrick, substantially as set forth.

XVILLIAM V. VEAVER.

iVitnesses:

F. A. HOPKINS, W. D. CRoss. 

